Part of your appeal argument should centre on the absolutely grotesque height of the two signs. I would think these impossible to see from a normal vehicle, as they are at first floor height of the houses. They turn "inadequate" into an art form !
However, this would seem to be a recent restriction, because GSV latest view of 2025 shows no restrictions at all. We need to know your approach, (it looks like you turned left into the restriction, but only the video will show the movement. I tried to view it on the Redbridge website, but nothing happens when I press the Send button. for your approach, we need to know if there is an advance sign. If you are able to return to the site we need to see what is there on approach and when you turn, from a driver viewpoint.